Cutting machine

Abstract

A rotary face plate is simply configured by including only a machine mechanism for rotating it on its axis. In order to achieve the configuration, a swing arm for a rotary blade is mounted on one side of the rotary face plate whereas a driving motor and a swing motor for the rotary blade in each of the swing arms are independently mounted on each of the swing arms on the other side. One side has only a function of rotating and cutting on the boundary of the face plate, and therefore, cutting chips can be remarkably readily removed. Only a rotating motor for a drive source is mounted on the other side. As a consequence, a round tube or a square tube having a square cross section can be cut only by controlling the motor for rotating the rotary face plate at a required angle.

What is claimed is: 
     
       1. A cutting machine comprising:
 a rotary face plate which has a cut material passing hole at its center and is held by a frame rotatably about the passing hole, the rotary face plate being rotated at a required angle by a rotating motor provided for the frame; 
 a swing arm which is pivotally supported at one end thereof on a first side of the rotary face plate and, at the other end thereof, is swingably held between an outer peripheral side of the face plate and an inner circumferential side of the passing hole via a pivot; 
 a rotation driving motor which is placed on a second side of the rotary face plate, the second side of the rotary face plate being opposite to the first side of the rotary face plate, and the rotation driving motor transmits rotational drive force to the swing arm via a driving shaft in the pivot of the swing arm, the driving shaft extending through the rotary face plate from the second side to the first side; 
 a swing motor which is placed on the second side of the rotary face plate and transmits swing force to the swing arm via a collar in the pivot of the swing arm, the collar extending through the rotary face plate from the second side to the first side, and the driving shaft being pivoted inside of the collar; 
 a cutting rotary blade pivotally supported at the other end of the swing arm; 
 a mechanism for transmitting the rotational drive force from the rotation driving motor to the cutting rotary blade, the mechanism being provided within the swing arm; 
 swing angle control means for varying the swing angle of the swing arm according to the dimensional shape of the cut material so as to bring the cutting rotary blade into contact with the cut material when the cut material is cut; and 
 rotational angle control means for rotating, at a required angle on its axis, the rotary face plate including the swing arm mounted thereon for pressing the cutting rotary blade against the cut material. 
 
     
     
       2. The cutting machine according to  claim 1 , wherein two, three, or four swing arms are mounted on the rotary face plate. 
     
     
       3. The cutting machine according to  claim 1 , wherein the swing arm is swingably supported at one or more portions other than the pivot on the rotary face plate, and thus, the swing arm is swung at the other end thereof between the outer peripheral side of the rotary face plate and the inner circumferential side of the passing hole. 
     
     
       4. The cutting machine according to  claim 1 , wherein the mechanism for transmitting the rotational drive force from the rotation driving motor to the cutting rotary blade includes the driving shaft of the rotation driving motor and a plurality of gears that are driven by the driving shaft to transmit the rotational drive force from the rotation driving motor to the cutting rotary blade. 
     
     
       5. The cutting machine according to  claim 1 , wherein the swing angle control means include a spindle gear rotated by the swing motor, an arcuate gear in mesh with the spindle gear and driven by the spindle gear, and the collar attached to the swing arm that is driven by the arcuate gear to vary the swing angle of the swing arm. 
     
     
       6. The cutting machine according to  claim 1 , wherein the rotational angle control means include the rotating motor provided for the frame and gears driven by the rotating motor to rotate the rotary face plate.